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受欢迎的代数 >

12=(x-2)(x+2)

解答

12 = (x - 2) (x + 2)

解答

x = 4, x = - 4

求解步骤

12 = (x - 2) (x + 2)

展开

(x - 2) (x + 2) : x^{2} - 4

12 = x^{2} - 4

交换两边

x^{2} - 4 = 12

将

12

para o lado esquerdo

x^{2} - 16 = 0

使用求根公式求解

x_{1, 2} = \frac{- 0 \pm 0 ^{2} - 4 \cdot 1 \cdot ( - 16 )}{2 \cdot 1}

0^{2} - 4 \cdot 1 \cdot (- 16) = 8

x_{1, 2} = \frac{- 0 \pm 8}{2 \cdot 1}

将解分隔开

x_{1} = \frac{- 0 + 8}{2 \cdot 1}, x_{2} = \frac{- 0 - 8}{2 \cdot 1}

x = \frac{- 0 + 8}{2 \cdot 1} : 4

x = \frac{- 0 - 8}{2 \cdot 1} : - 4

二次方程组的解是:

x = 4, x = - 4

作图

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